improve project dialog system

- project model : refactor getSteps() method
- create dialog store
- create DialogWrapper component that open the dialog corresponding to the URL query param

src/components/project/DialogWrapper.vue

@@ -0,0 +1,9 @@
+<template>
+  <PdfViewer v-if="dialog.content.id === 'clientBrief'" />
+</template>
+<script setup>
+import PdfViewer from "./client-brief/PdfViewer.vue";
+import { useDialogStore } from "../../stores/dialog";
+
+const dialog = useDialogStore();
+</script>